Which of the following is true regarding each repair weld?

Each repair weld must adhere to multiple important standards and protocols to ensure safety, quality, and compliance with industry regulations. One of the fundamental requirements is that a certified repair welder must perform the weld. This certification ensures that the welder has the necessary skills and knowledge to execute repairs correctly and safely.

Additionally, supervision during the repair welding process is crucial. Supervision helps to maintain adherence to established procedures, ensuring that repairs are executed according to specified standards and guidelines.

Furthermore, the use of a qualified repair welding procedure is essential. These procedures outline the methods, materials, and techniques an experienced welder should follow to create a sound weld, thereby preventing failures that could arise from incorrect practices.

Considering these points, all aspects mentioned—certification of the welder, supervision of the work, and adherence to a qualified procedure—are integral to performing a legitimate and effective repair weld. Thus, the option encompassing all these requirements is accurate, reflecting the comprehensive standards that govern repair welding in pipeline operations.